The molecules doesn't need energy to cross through.
The diffusion doesn't need protien, the molecules pass between phospholipids by passes protien. It moves smaller molecules. Facilitated need protien also hormone, and larger molecules.
I wish it makes sense.
Answer:
Famine.
Explanation:
Famine, a shortage of water or food, will often result in a significant population decrease.
Internal fertilization protects<span> the </span>fertilized egg<span> or embryo from predation and harsh environments</span>
They are considered to have originated from cyanobacteria through endosymbiosis—when a eukaryotic cell engulfed a photosynthesizing cyanobacterium that became a permanent resident in the cell